51211439 has 2 divisors, whose sum is σ = 51211440. Its totient is φ = 51211438.

The previous prime is 51211421. The next prime is 51211451. The reversal of 51211439 is 93411215.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51211439 - 2⁸ = 51211183 is a prime.

It is a super-2 number, since 2×51211439² = 5245222968901442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51211339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25605719 + 25605720.

It is an arithmetic number, because the mean of its divisors is an integer number (25605720).

Almost surely, 2^51211439 is an apocalyptic number.

51211439 is a deficient number, since it is larger than the sum of its proper divisors (1).

51211439 is an equidigital number, since it uses as much as digits as its factorization.

51211439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1080, while the sum is 26.

The square root of 51211439 is about 7156.2168077833. The cubic root of 51211439 is about 371.3547583458.

The spelling of 51211439 in words is "fifty-one million, two hundred eleven thousand, four hundred thirty-nine".